<RESEARCH REPORT>LIMIT OF POSSIBLE OPERATION OF CRESCENT AND BEAN SHAPED TOKAMAKS
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概要
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The maximum attainable beta values which can be expected by the crescent (BEAN1) and rounded bean (BEAN2) shaped tokamaks are obtained numerically by using the linear ideal MHD stability analysis code ERATO. The current profiles are optimized with the fixed pressure profile for the higher beta value keeping Mercier, high n ballooning, and n=1 kink modes stable (n is the toroidal mode number). The plasma poloidal cross-sections are inscribed in the rectangle with aspect ratio of 3 and ellipticity of 2. The confocal wall, with the distance from the plasma surface being equal to the plasma horizontal minor radius, is assumed for the stability against the kink mode. Triangularity and indentaion dependences of the maximum beta value are investigated carefully. The beta value of 10-17 percents is obtained depending on the shape and triangularity (indentation). It is also shown that the coefficient of the Troyon-type beta scaling enhances for the indented plasma. In the case of small indentation, the BEAN1 shape tokamak characterized by mild indentation and high triangularity shows higher beta value than BEAN2. For strong indentation, the BEAN2 shape tokamak gives highest beta value, although this configuration is unstable at low beta for the n=1 mode; the operational scenario to reach the maximum beta must be carefully planned. For equilibria with sufficient indentation, the closer wall will largely enhance the maximum beta value because the n=1 kink mode is limiting beta and the ballooning beta boundary is much higher.
- 核融合科学研究所の論文
- 1987-07-00
著者
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Yamazaki K.
Research Information Center, Institute of Plasma Physics, Nagoya University
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Naitou H.
Reseach Information Center Institute Of Plasma Physics Nagoya University
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Naitou H.
Research Information Center Institute Of Plasma Physics. Nagoya University
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